Having your 25 most recently used workbooks on the File tab, in the Open menu is handy, but you may find it's not enough. You can increase the number shown up to 50, and you can pin (fasten) particular workbooks to the menu so that they remain there even if you haven't used them recently.
Suppose you'd like to add a couple more commands to the Quick Access toolbar. Also, say you're a big fan of AutoSum. You can add the AutoSum button to the Quick Access toolbar, so you can quickly create and use AutoSum entries.
Creating custom menus in Excel is a funny feature you can use to create groups of the options you use
most often and then plug them into the menu you name and use yourself.
Often you'll want to insert a series of dates into a worksheet. The most efficient way to enter a series of dates doesn't require any formulas - just use Excel's AutoFill feature.
The Solver tool allows you to specify multiple adjustable cells and constraints on the values that the adjustable cells can have, generate a solution that maximizes or minimizes a particular worksheet cell, generate multiple solutions to a problem.
Goal seeking is a useful feature that works in conjunction with your formulas. If you know what a formula result should be, Excel can tell you which values of one or more input cells you need to produce that result.
Because timestamps are represented as serial numbers, you can subtract the earlier time from the later time
to get the difference.
When calculating the difference between two dates, you may want to exclude weekends and holidays.
By default, the number of Undo levels in Excel for Microsoft 365 is 100. You can increase or decrease this number if it's necessary.
Excel's ability to create automatic subtotals is a handy feature that can save you a great deal of time.